QSP-20 Quad Studio Preamplifier Users Manual QSP-20 USERS MANUAL VERSION-1, JULY 2010. CONTENTS COPYRIGHT BUZZ AUDIO LTD 2010. PO BOX 6677, TE ARO. WELLINGTON, 6141 NEW ZEALAND. PH. +64-4-472-3084 www.buzzaudio.com email management@buzzaudio.co.
Welcome… Thank you for choosing the Buzz Audio QSP-20 Quad Studio Preamplifier. In this manual you will find important information regarding the use of the QSP and we suggest you do read it before using the unit to become familiar with all the controls and their function. If after unpacking the QSP you find any damage to the unit you should contact your dealer or supplier immediately for advice on what to do.
1] Installation Precautions The QSP-20 preamplifier uses Class A amplifiers and these plus the power supply do generate a fair amount of heat. Normally the QSP can be mounted into a rack without any special ventilation needs unless there are other units in the rack that also run hot. Avoid mounting the QSP in close proximity to other units that have unshielded power transformers or switching power supplies. Pickup of noise from these devices may be a problem at high gain settings.
Instrument Inputs Tip (T) = Signal + (hot) Ring (R) = Signal ground (shield) Sleeve (S) = Signal ground (shield) The QSP mic input is intended for use with microphones only, and connection of other sources is not recommended. It is important that the pin 1 (shield) is used and terminated at both the microphone and QSP ends of the cable. The pin1 connection of the Line out is not part of the audio path, and is provided to shield the interconnecting cable.
0°/MUTE/180° This 3 position switch is used to reverse the polarity of the QSP channel output signal or to mute the output signal (centre position). When selected to 180° the output signal is reversed to that of the input. This is useful in stereo recording where the mics may be spaced. HI-Z/LO-Z This switch changes the impedance the microphones “sees” at the input to the QSP channel. Depending on the mic, this will result in subtle tonal changes to the sound.
5] Specifications Min Gain Mic = +22dB (-2dB with pad in) Max Gain Mic = +70dB Min Gain Instrument = +12dB (-3dB with pad in) Max Gain Instrument = +60dB Maximum Output Level = +29dBu into 3k ohm load. Frequency Response Mic = 10Hz to 300kHz @ 20dB gain (-3dB). Instrument = 10Hz to 120kHz @ 20dB gain (-3dB). Total Harmonic Distortion (measured at -20dBu input, gain adjusted for +10dBu output level) Mic = 0.15% @ 100Hz, 0.01% @ 1kHz, 0.005% @ 10kHz Instrument = 0.15% @ 100Hz, 0.015% @ 1kHz, 0.
] Product Warranty • Disclaimer Buzz Audio is not liable for any damage to microphones, amplifiers, consoles, speakers or any other equipment and/or electric shock to humans that is caused by negligence or improper installation and/or use of the QSP-20 Quad Studio Preamplifier.
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